When rounding corners, a vehicle's outer wheels travel further than the inner ones. The differential gear set prevents skidding by letting the wheels rotate at different speeds. This results in safe, smooth turns.
The Mr. Lube Differential Fluid Change Service replaces old gear oil containing harmful metal fragments with new lubricant to reduce wear and prolong the life of the gears and bearings within the differential. Check your owner's manual for the required service interval for your vehicle.